5.4

CVE-2026-55491

BigBlueButton: Stored XSS in Screenshare Recording Playback via Unescaped Meeting Name

Stored XSS in Screenshare Recording Playback via Unescaped Meeting Name

BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton failed to escape meetingName in record-and-playback/screenshare/playback/index.html.erb when generating the screenshare playback format. A low-privileged user could store a crafted meeting name that embedded script content, and the script executed in another user's browser when that user replayed the recording. This issue is fixed in version 3.0.29.
Mögliche Gegenmaßnahme
Server: We recommend updating to the patched version of BigBlueButton.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellerbigbluebutton
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Produkt bigbluebutton
Version < 3.0.29
Status affected
VulnDex Vulnerability Enrichment
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Weitere Schwachstelleninformationen
SystemBigBlueButton
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Produkt Server
Version < 3.0.29
Zu dieser CVE wurde keine Warnung gefunden.
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 5.4 2.3 2.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c888-74f9
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29
https://github.com/bigbluebutton/bigbluebutton/commit/a53f2b92022388bfa4109d3136d1f3a932404b1b
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c888-74f9
Third Party Advisory